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Title: FURTHER STUDIES OF SINTERED REFRACTORY URANIUM COMPOUNDS

Abstract

The refractory uranium compounds UC and UC/sub 2/ were prepared by arc- melting methods, UN by gas solid reactions, and UB/sub 2/ and UBe/aub 13/ by solid-solid reactions. Techniques for sintering powder compacts of these compounds to densities 90% of theoretical or greater were developed. Mean linear thermal-expansion coefficients of 7.9 x 10/sup -6/ per deg F for Uc and 9.3 x 1O/ sup -6/ per deg F for UBe/sub 13/ were obtained in the range 68 to 1800 deg F. The thermal conductivity of sintered UBe/sub 13/ increased from 0.050 cal/ (sec)(cm)(C) at 1OO deg c to 0.064 cal/(sec)(cm)(C) at 650 deg C. The electrical resistivity of sintered UBe/sub 13/ was 113 microhm-cm at 27.6 deg c. Knoop microhardness values varied from 500 for sintered UC/sub 2/ to 1155 for sintered UBe/sub 13/. Sintered Uc and Uc/sub 2/ decompose rapidly in boiling (atmospheric pressure) water. A sintered UBe/sub 13/ compact lost 2.2 mg per cm/sup 2/ (average), after 72 hr in boiling water (atmospheric pressure). Uc/sub 2/ reacts more rapidly with nitrogen and oxygen than does pure uranium. UB/sub 2/ and UBe/ sub 13/ were less reactive with oxygen and nitrogen than is pure uranium. The heat of formationmore » of Uc was -20 plus or minus 5 kcal per mole at 25 deg c. Standard free-energyof-formation equations were estimated for UN, USi/sub 2/, US, UB/sub 2/, UC/sub 2/, and Uc. (auth)« less

Authors:
; ;
Publication Date:
Research Org.:
Battelle Memorial Inst., Columbus, Ohio
OSTI Identifier:
4293021
Report Number(s):
BMI-1313
NSA Number:
NSA-13-008908
DOE Contract Number:  
W-7405-ENG-92
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
METALLURGY AND CERAMICS; BERYLLIUM ALLOYS; BOILING; CHEMICAL REACTIONS; COMPACTING; DECOMPOSITION; DENSITY; ELECTRIC ARCS; ELECTRIC CONDUCTIVITY; EQUATIONS; EXPANSION; FORMATION HEAT; FREE ENERGY; GASES; HARDNESS; HIGH TEMPERATURE; IMPURITIES; INTERMETALLIC COMPOUNDS; MELTING; NITROGEN; OXYGEN; POWDERS; PREPARATION; PRESSURE; REFRACTORIES; SINTERED MATERIALS; SOLIDS; STANDARDS; TEMPERATURE; THERMAL CONDUCTIVITY; THERMODYNAMICS; URANIUM; URANIUM ALLOYS; URANIUM BORIDES; URANIUM CARBIDES; URANIUM NITRIDES; URANIUM SILICIDES; URANIUM SULFIDES; WATER

Citation Formats

Tripler, A.B. Jr., Snyder, M.J., and Duckworth, W.H. FURTHER STUDIES OF SINTERED REFRACTORY URANIUM COMPOUNDS. United States: N. p., 1959. Web. doi:10.2172/4293021.
Tripler, A.B. Jr., Snyder, M.J., & Duckworth, W.H. FURTHER STUDIES OF SINTERED REFRACTORY URANIUM COMPOUNDS. United States. doi:10.2172/4293021.
Tripler, A.B. Jr., Snyder, M.J., and Duckworth, W.H. Tue . "FURTHER STUDIES OF SINTERED REFRACTORY URANIUM COMPOUNDS". United States. doi:10.2172/4293021. https://www.osti.gov/servlets/purl/4293021.
@article{osti_4293021,
title = {FURTHER STUDIES OF SINTERED REFRACTORY URANIUM COMPOUNDS},
author = {Tripler, A.B. Jr. and Snyder, M.J. and Duckworth, W.H.},
abstractNote = {The refractory uranium compounds UC and UC/sub 2/ were prepared by arc- melting methods, UN by gas solid reactions, and UB/sub 2/ and UBe/aub 13/ by solid-solid reactions. Techniques for sintering powder compacts of these compounds to densities 90% of theoretical or greater were developed. Mean linear thermal-expansion coefficients of 7.9 x 10/sup -6/ per deg F for Uc and 9.3 x 1O/ sup -6/ per deg F for UBe/sub 13/ were obtained in the range 68 to 1800 deg F. The thermal conductivity of sintered UBe/sub 13/ increased from 0.050 cal/ (sec)(cm)(C) at 1OO deg c to 0.064 cal/(sec)(cm)(C) at 650 deg C. The electrical resistivity of sintered UBe/sub 13/ was 113 microhm-cm at 27.6 deg c. Knoop microhardness values varied from 500 for sintered UC/sub 2/ to 1155 for sintered UBe/sub 13/. Sintered Uc and Uc/sub 2/ decompose rapidly in boiling (atmospheric pressure) water. A sintered UBe/sub 13/ compact lost 2.2 mg per cm/sup 2/ (average), after 72 hr in boiling water (atmospheric pressure). Uc/sub 2/ reacts more rapidly with nitrogen and oxygen than does pure uranium. UB/sub 2/ and UBe/ sub 13/ were less reactive with oxygen and nitrogen than is pure uranium. The heat of formation of Uc was -20 plus or minus 5 kcal per mole at 25 deg c. Standard free-energyof-formation equations were estimated for UN, USi/sub 2/, US, UB/sub 2/, UC/sub 2/, and Uc. (auth)},
doi = {10.2172/4293021},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1959},
month = {1}
}